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Full text of "The manufacture and properties of iron and steel"

202
METALLURGY OF IRON AND STEEL.
added. ^Notwithstanding the high acid content, the slag, after melting, held quite an appreciable proportion of sulphur. The final slag, being richer in lime, removed a greater quantity, and the results seem to show that, as the silica decreases, the capacity for sulphur increases, but the relation is not as regular as might be wished. /The records are given in Tables XI-H and XI-L
TABLE XI-I Basic Open-Hearth Slags before adding Eecarburizer.
1	ji	Sulphur, after melting.		d {a S* jao**	Composition of slag before adding the recarburizer, per cent.				
1*	Its. H	Slag, per cc.	Metal, per ct.	s-SS CD	8.	SiO,.	FeO.	GaO.	MnO.
1608	.28	.22	.17	.096	.61	12.78	20.91	48.99	und.
1611	.20	.26	.14	.054	.68	10.45	26.19	45.85	und.
1555	.28	.14	.22	.086	.56	18.78	26.91	42.14	4.85
1606	.28	.12	.19	.100	.54	12.90	81.14	88.58	und.
1669	.28	.08	.19	.089	.48	15.90	18.68	und.	und.
1680	.20	.14	.09	.062	.48	16.26	19.98	49.50	und.
1546	.48	.28	.28	.120	.86	18.67	24.84	87.28	4.44
1567	.28	.20	.18	.062	.88	14.85	28.49	45.74	4.64
1564	.28	.17	.10	.089	.38	10.18	16.11	49.98	4.58
1648	.20	.21	.14	.090	.26	17.97	28.04	44.41	und.
(4) By oxychloride of lime. A process has been devised by E. H. Saniter* whereby sulphur is eliminated from basic open-hearth metal by oxychloride of lime. It is important to note that "to attain this result it is necessary, at an early period after the charge is melted, to obtain an exceedingly basic slag, and to add a suitable quantity of calcium chloride to it"; and it is specified that "by a very basic slag is not meant what has hitherto been considered as such, but a step in advance of that with about 50 to 60 per cent, of lime/' This point is also insisted upon by Stead,t who states that the chloride is used "in conjunction with an excess of lime over and above what is usually employed/|/He gives analyses of slag and metal for two charges, and a summary of these is given in Table XI-J. The results of a more complete investigation of one charge are shown in Table XI-K, the data being taken from a paper by Snelus.J
*Oi a New process for the Purification of Iron and Steel from. Sulphur. Journal J. and 8. /., Vol. II, 1892, p. 216; also, A. Supplementary Paper on a New Process on Desulphurizing Iron and Steel. Journal I, and 8. J.,Vol. 1,1893, p. 73.
i On the Elimination of Sulphur from Iron.   Journal I. and 8.1., Vol. II, 1892, p. 260.
$ Report upon the Saniter Deaulphurization Process. Journal I. and S. I,, Vol. 1,1893, p. 82.                                                                                                 .